CP-850FX Service Manual
Europe R&D
41
4.10 STR – W6754
4.10.1 GENERAL DESCRIPTION
The STR-W6700 series is a Hybrid IC (HIC) designed for Quasi-Resonant type Switching Mold
Power Supply built-in a Power MOSFET and Control IC.
4.10.2 FEATURES
operation mode turns blocking oscillation by reducing output voltage at stand-by mode.
In addition to the existing Quasi-Resonant Operation, the Bottom-Skip Function is added in
order to be efficient from light to medium load.
Soft-Start Operation is provided at the SMPS start-up.
Switching noise is reduced by Step-Drive Function.
Avalanche energy of the MOSFET is guaranteed.
Overcurrent Protection (OCP), Overvoltage Protection (OVP), Overload Protection (OLP),
and Maximum ON-Time control circuits are incorporated.
It is possible to save the SMPS design time by utilizing the present designs and evaluation
processes.
4.10.3 BLOCK DIAGRAM
D
S/GND
OCP/BD
V
CC
４４
３３
FB
＋
－
＋
－
Start
Stop
Burst
R
S
Q
Reg&
Iconst
OVP
DRIV E
Reg
１１
７７
Abnorm al
latch
S
RQ
FB
－
＋
＋
－
OCP
＋
－
BSD
＋
－
BD
Bottom Selector
Counter
５５
SS/OLP
－
＋
OLP
Delay
６６
S
R
Q
S
R
Q
S
R
Q
OSC
MaxON
Soft Start
Burst
Contr ol
Burst
Contr ol
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